JP2015098987A - Refrigeration system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cold storage system capable of restricting the temperature rise in a cold room when a door provided at a lower portion of the cold room is opened.SOLUTION: A cold storage system 100 comprises: a refrigeration warehouse 1; air conditioners 3 and 4 cooling the refrigeration warehouse 1; a door 2 provided at a lower portion of the refrigeration warehouse 1 allowing an article to carry-in/carry-out in/of the refrigeration warehouse 1; temperature sensors 34 and 44 provided at inside upper portions of the refrigeration warehouse 1; door temperature sensors 21 and 22 provided at inside lower portions of the refrigeration warehouse 1; and control parts 31 and 41 for controlling the air conditioners 3 and 4 such that when the door 2 is closed, controlling the air conditioners 3 and 4 on the basis of the temperature detected by the temperature sensors 34 and 44 and when the door 2 is opened, controlling the air conditioners 3 and 4 on the basis of the temperature detected by the door temperature sensors 21 and 22.

Description

  The present invention relates to a refrigeration system, and particularly to a refrigeration system including a plurality of temperature sensors.

  Conventionally, a refrigeration system including a plurality of temperature sensors is known (see, for example, Patent Document 1).

  Patent Document 1 discloses a refrigerated warehouse including a refrigeration room, an air conditioner for cooling the refrigeration room, an upper temperature sensor provided on a ceiling in the refrigeration room, and a lower temperature sensor provided on a floor in the refrigeration room ( Refrigeration system) is disclosed. In this refrigerated warehouse, in order to reduce the temperature difference between the temperature near the ceiling (upper) where the temperature tends to increase due to solar radiation and the temperature near the floor (lower) where the cold tends to accumulate and the temperature tends to decrease, it is refrigerated. There is provided a control device that performs control to blow cool air from the lower part to the upper part when the temperature difference between the upper part and the lower part in the room exceeds a predetermined value.

Japanese Patent Laid-Open No. 10-103841

  In the refrigerated warehouse according to Patent Document 1, when the temperature of the upper part of the refrigerator compartment is higher than the temperature of the lower part, when the temperature difference between the upper part and the lower part of the refrigerator compartment exceeds a predetermined value, By performing the control of blowing the cool air to the inside, the cool air in the lower part of the refrigerator compartment is sent to the upper part, and the temperature in the refrigerator compartment can be made uniform. However, when the door provided in the lower part of the refrigerator compartment is opened, it is considered that the cold air escapes from the lower part of the refrigerator compartment to the outside, and the temperature of the lower part in the refrigerator compartment becomes higher than the temperature of the upper part. In this case, in the above-mentioned Patent Document 1, since the cooling air is not blown, there is a problem that the temperature in the refrigerator compartment increases when the door provided in the lower part of the refrigerator compartment is opened.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to increase the temperature in the refrigerator compartment when the door provided at the lower portion of the refrigerator compartment is opened. It is providing the refrigeration system which can suppress this.

  A refrigeration system according to one aspect of the present invention includes a refrigeration room, an air conditioner that cools the refrigeration room, a door that is provided in a lower part of the refrigeration room, and that allows an article to be carried into and out of the refrigeration room, and an upper part in the refrigeration room. When the first temperature sensor provided, the second temperature sensor provided in the lower part of the refrigerator compartment, and the door are closed, the air conditioner is controlled based on the temperature detected by the first temperature sensor. When the door is opened, a control unit is provided for controlling the air conditioner based on the temperature detected by the second temperature sensor.

  In the refrigeration system according to one aspect of the present invention, as described above, when the door is closed, the air conditioner is controlled based on the temperature detected by the first temperature sensor, and the door is opened. If the lower door in the refrigerator compartment is opened by providing a control unit that controls the air conditioner based on the temperature detected by the second temperature sensor, the lower temperature becomes higher than the upper part. Since the air conditioner can be controlled based on the temperature detected by the second temperature sensor, the refrigerator compartment can be quickly cooled when the door is opened. Thereby, when the door provided in the lower part of the refrigerator compartment is opened, it can control that the temperature in a refrigerator compartment becomes high. In addition, when the door is closed, the air conditioner is turned on based on the temperature detected by the first temperature sensor arranged at the upper part where the temperature is higher than the lower part due to solar radiation or natural convection of air. Since it can control, it can suppress that the temperature of the upper part in a refrigerator compartment becomes high at the time of obstruction | occlusion of a door. Further, when the door is opened, the air conditioner is controlled not only based on the opening of the door but also based on the temperature detected by the second temperature sensor, so that the temperature in the refrigerator compartment can be accurately controlled. . Thereby, excessive cooling can be suppressed and energy saving can be achieved.

  In the refrigeration system according to the above aspect, preferably, the first temperature sensor is disposed in the vicinity of the upper air conditioner in the refrigeration room, and the second temperature sensor is disposed in the vicinity of the lower door in the refrigeration room. ing. If comprised in this way, since the 2nd temperature sensor arrange | positioned in the vicinity of a door can detect rapidly the temperature rise near the door of the refrigerator compartment resulting from the door being opened, an air conditioner can be The refrigerator can be quickly cooled by control. In addition, the air conditioner is controlled by the temperature detected by the first temperature sensor disposed in the vicinity of the air conditioner in the refrigerator compartment, and the temperature of the upper part in the refrigerator compartment is effectively prevented from increasing when the door is closed. it can.

  In the refrigeration system according to the above aspect, the air conditioner preferably includes a refrigerator, a refrigerator indoor air conditioner connected to the refrigerator, and a control valve that controls a flow of refrigerant flowing into the refrigerator indoor air conditioner. The control unit controls on / off of the refrigerating room air conditioner by controlling opening and closing of the control valve, and the temperature detected by the second temperature sensor is the first when the door is open. When the temperature is higher than the threshold temperature, the refrigeration room air conditioner is forcibly turned on by performing control to open the control valve. With this configuration, when the door is opened and the temperature in the lower part of the refrigerator compartment becomes higher than the first threshold temperature, the refrigerator air conditioner is forcibly turned on by the control of the control valve. Therefore, when the door is opened, it is possible to reliably suppress the temperature in the refrigerator compartment from increasing.

  In this case, preferably, a door sensor for detecting the opening of the door is further provided, and the control unit detects the opening of the door by the door sensor and the temperature detected by the second temperature sensor is the first threshold. When the temperature is higher than the value temperature, the air conditioner is forcibly turned on, the door sensor detects the opening of the door, and the temperature detected by the second temperature sensor is the first threshold. When the temperature is equal to or lower than the value temperature, the air conditioner is turned on / off based on the temperature detected by the first temperature sensor. If comprised in this way, since opening of a door can be easily detected using a door sensor, the temperature in a refrigerator compartment is easily controlled based on the temperature detected by the 1st temperature sensor or the 2nd temperature sensor. be able to. Also, if the temperature in the lower part of the refrigerator compartment does not rise even when the door is opened, the air conditioner is controlled based on the first temperature sensor in the upper part of the refrigerator compartment, so the temperature in the refrigerator compartment is controlled more accurately. can do.

  In the configuration in which the control unit controls on / off of the refrigerating room air conditioner by controlling opening and closing of the control valve, preferably, the control unit performs on / off control of the air conditioner based on the temperature detected by the first temperature sensor. When performing, when the temperature detected by the first temperature sensor is lower than the second threshold temperature lower than the first threshold temperature and when opening of the door is detected, the air conditioner is turned on / off It is configured to maintain control. With this configuration, even when the door is open, if the temperature in the upper part of the refrigerator compartment is lower than the second threshold temperature and cooling is sufficient, the air conditioner is kept on and off. Appropriate cooling state can be maintained. Thereby, the temperature rise resulting from opening of a door can be suppressed effectively.

  In the refrigeration system according to the above aspect, preferably, the air conditioner includes a plurality of air conditioners, and the first temperature sensor and the second temperature sensor are provided for each of the plurality of air conditioners, and the plurality of air conditioners are provided. When the door is closed, the machine is controlled independently from each other based on the temperature detected by the first temperature sensor provided for each of the plurality of air conditioners, and the door is opened. These are configured to be controlled independently of each other based on the temperature detected by the second temperature sensor provided for each of the plurality of air conditioners. According to this structure, when the door is opened, the plurality of second temperature sensors are controlled by independently controlling the plurality of air conditioners based on the detection results of the plurality of second temperature sensors provided individually. Since a plurality of air conditioners can be individually controlled in accordance with the temperature at the installation position, more accurate temperature rise suppression control can be performed when the door is opened.

  ADVANTAGE OF THE INVENTION According to this invention, when the door provided in the lower part of the refrigerator compartment is opened as mentioned above, it can suppress that the temperature in a refrigerator compartment becomes high.

1 is a schematic diagram showing a schematic overall configuration of a refrigeration system according to an embodiment of the present invention. It is the flowchart which showed the cooling control process by the control part of the refrigeration system by one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  With reference to FIG. 1, the structure of the refrigeration system 100 by one Embodiment of this invention is demonstrated.

  The refrigeration system 100 according to the present embodiment is configured such that an article can be refrigerated and stored under temperature control at a low temperature. In addition, as shown in FIG. 1, the refrigeration system 100 includes a refrigerated warehouse 1, a door 2 for carrying items into and out of the refrigerated warehouse 1, air conditioners 3 and 4 for cooling the refrigerated warehouse 1, and an air conditioner 3. And a control device 5 that comprehensively controls 4 and 4. The refrigerated warehouse 1 is an example of the “refrigerated room” in the present invention.

  The air conditioner 3 includes a control unit 31, a unit cooler 32, a refrigerator 33, and a temperature sensor 34. The unit cooler 32 includes an evaporator 35, an expansion valve 36, and an electromagnetic valve 37. The refrigerator 33 includes a compressor 38 and a condenser 39. The air conditioner 4 includes a control unit 41, a unit cooler 42, a refrigerator 43, and a temperature sensor 44. The unit cooler 42 includes an evaporator 45, an expansion valve 46, and an electromagnetic valve 47. The refrigerator 43 includes a compressor 48 and a condenser 49. The unit coolers 32 and 42 are examples of the “refrigerated indoor air conditioner” of the present invention, and the temperature sensors 34 and 44 are examples of the “first temperature sensor” of the present invention. The solenoid valves 37 and 47 are examples of the “control valve” in the present invention.

  The refrigerated warehouse 1 is configured to store articles that are refrigerated. In addition, articles are carried into or out of the refrigerated warehouse 1 through the door 2. In the refrigerator warehouse 1, a floor, a wall, and a ceiling are formed of a material including a heat insulating material.

  The door 2 is provided in order to load / unload the article into / from the refrigerated warehouse 1. The door 2 is provided on the side surface of the lower part of the refrigerated warehouse 1. That is, by opening the lower door 2 of the refrigerated warehouse 1, it is possible to load and unload articles into and from the refrigerated warehouse 1, and by closing the door 2, the refrigerated warehouse 1 is shielded from the outside air to improve heat retention. It is configured as follows. Moreover, the door 2 is formed with the material containing a heat insulating material. In the vicinity of the door 2, door temperature sensors 21 and 22 and a door sensor 23 for detecting the opening of the door 2 are provided. Each of the door temperature sensors 21 and 22 is an example of the “second temperature sensor” in the present invention.

  The door temperature sensors 21 and 22 are configured to detect the temperature in the vicinity of the door 2. Moreover, the door temperature sensors 21 and 22 are provided in the lower part (for example, floor surface or lower wall surface) in the refrigerated warehouse 1. Moreover, the door temperature sensors 21 and 22 are provided for each air conditioner (unit cooler). The door temperature sensor 21 is disposed in the vicinity of the door 2 on the side closer to the unit cooler 32 with respect to the door 2. The door temperature sensor 22 is disposed in the vicinity of the door 2 on the side closer to the unit cooler 42 with respect to the door 2. The door temperature sensor 21 is connected to the control unit 31 of the air conditioner 3. The door temperature sensor 22 is connected to the control unit 41 of the air conditioner 4.

  The door sensor 23 is configured to detect opening and closing of the door 2. The door sensor 23 is connected to the control device 5 and is configured to transmit a detection result of opening / closing of the door 2 to the control device 5. The detection result of opening / closing of the door 2 is also transmitted to the control units 31 and 41 via the control device 5.

The air conditioner 3 is configured to circulate a refrigerant such as carbon dioxide (CO ₂ ) through the compressor 38, the condenser 39, the expansion valve 36 and the evaporator 35 to cool the refrigerated warehouse 1.

  The compressor 38 is configured to be driven based on the control of the control device 5. The compressor 38 has a role of compressing the gas refrigerant sucked from the low pressure side in the air conditioner 3 and discharging it to the high pressure side. The compressor 38 is an inverter-controlled compressor capable of controlling the refrigerant discharge amount by changing the rotation speed (operation frequency).

  The condenser 39 has a function of cooling the superheated gas refrigerant flowing through the inside using external air. Further, the refrigerant condensed (liquefied) in the condenser 39 flows into the expansion valve 36 via the electromagnetic valve 37.

  The expansion valve 36 has a role of expanding and reducing (depressurizing) the refrigerant cooled (liquefied) by the condenser 39 and supplying the refrigerant to the evaporator 35. The expansion valve 36 is configured to open and close the valve mechanism using the driving force of a stepping motor driven by pulse control. Further, the liquid refrigerant expanded and contracted by the expansion valve 36 flows into the evaporator 35 in a gas-liquid two-phase state composed of a gas phase and a liquid phase.

  The evaporator 35 is provided with a blower (not shown), and air (cool air) for cooling the inside of the refrigerator warehouse 1 is circulated between the evaporator 35 and the refrigerator warehouse 1 by the fan. It is configured. Further, the evaporator 35 takes heat from the circulating air and cools the circulating air when the circulating refrigerant evaporates (vaporizes). The evaporated refrigerant in the evaporator 35 is returned to the compressor 38 in a gas state containing a large amount of gas phase. As described above, in the air conditioner 3, the refrigerant discharged from the compressor 38 repeats a cycle in which the refrigerant 39 flows in the order of the condenser 39, the expansion valve 36, and the evaporator 35 and is returned to the compressor 38.

  The electromagnetic valve 37 is disposed between the condenser 39 and the expansion valve 36 and is configured to control the flow of the refrigerant flowing into the unit cooler 32. Specifically, the solenoid valve 37 is configured to flow (turn on) or stop (turn off) the refrigerant by the on / off control of the control unit 31. When the time for turning off the solenoid valve 37 (stopping the refrigerant) becomes longer, the heat exchange amounts in the condenser 39 and the evaporator 35 become smaller, and the heat load becomes lower. In this case, the output (rotation speed) of the compressor 38 is lowered or stopped by the control device 5. On the other hand, when the time for turning on the electromagnetic valve 37 (flowing refrigerant) becomes longer, the heat exchange amounts in the condenser 39 and the evaporator 35 become larger, and the heat load becomes higher. In this case, the output (rotation speed) of the compressor 38 is increased by the control device 5.

  The control unit 31 is configured to control each unit of the air conditioner 3. In particular, the control unit 31 is configured to perform on / off control of the electromagnetic valve 37 and to control on / off of the unit cooler 32 of the air conditioner 3. Further, the control unit 31 performs on / off control of the solenoid valve 37 based on the temperature detected by the temperature sensor 34 disposed near the unit cooler 32 or the temperature detected by the door temperature sensor 21 disposed near the door 2. Is configured to do. That is, when the detected temperature becomes higher than the target temperature, the control unit 31 performs control to increase the ON time of the electromagnetic valve 37. Moreover, the control part 31 performs control which shortens the ON time of the solenoid valve 37, when the detected temperature becomes lower than target temperature.

  The temperature sensor 34 is configured to detect the temperature near the unit cooler 32. The temperature sensor 34 is provided in the vicinity of the upper unit cooler 32 in the refrigerated warehouse 1 (for example, in the vicinity of the air inlet). The temperature sensor 34 is connected to the control unit 31.

  The air conditioner 4 is provided separately from the air conditioner 3 and is driven independently of the air conditioner 3. Moreover, the structure of each part of the air conditioner 4 is the same as that of the said air conditioner 3, and description is abbreviate | omitted. That is, the control unit 41, the unit cooler 42, the refrigerator 43, and the temperature sensor 44 of the air conditioner 4 correspond to the control unit 31, the unit cooler 32, the refrigerator 33, and the temperature sensor 34 of the air conditioner 3, respectively. Further, the evaporator 45, the expansion valve 46, and the electromagnetic valve 47 of the unit cooler 42 correspond to the evaporator 35, the expansion valve 36, and the electromagnetic valve 37 of the unit cooler 32, respectively. The compressor 48 and the condenser 49 of the refrigerator 43 correspond to the compressor 38 and the condenser 39 of the refrigerator 33, respectively.

  The control device 5 is configured to control the output of the refrigerator 33 (compressor 38) based on the operating state of the air conditioner 3 (unit cooler 32 and refrigerator 33). Moreover, the control apparatus 5 is comprised so that the output of the refrigerator 43 (compressor 48) may be controlled based on the operation state of the air conditioner 4 (unit cooler 42 and refrigerator 43).

  Here, in the present embodiment, when the door 2 is closed, the control unit 31 (41) controls the air conditioner 3 (4) based on the temperature detected by the temperature sensor 34 (44). When the door 2 is opened, the air conditioner 3 (4) is controlled based on the temperature detected by the door temperature sensor 21 (22). The control unit 31 (41) controls the on / off of the unit cooler 32 (42) by controlling the opening and closing of the electromagnetic valve 37 (47), and the door 2 is opened and the door When the temperature detected by the temperature sensor 21 (22) is higher than the set temperature, the unit cooler 32 (42) is forcibly turned on by performing control to open the electromagnetic valve 37 (47). Has been. The set temperature is an example of the “first threshold temperature” in the present invention.

  Moreover, in this embodiment, when the control part 31 (41) detects opening of the door 2 by the door sensor 23, and the temperature detected by the door temperature sensor 21 (22) is higher than preset temperature. In addition, the air conditioner 3 (4) is forcibly turned on, and the door sensor 23 detects the opening of the door 2 and the temperature detected by the door temperature sensor 21 (22) is set. When the temperature is equal to or lower than the temperature, the air conditioner 3 (4) is controlled to be turned on / off based on the temperature detected by the temperature sensor 34 (44).

  Further, when the controller 31 (41) performs on / off control of the air conditioner 3 (4) based on the temperature detected by the temperature sensor 34 (44), the temperature detected by the temperature sensor 34 (44) is set. When the temperature is lower than the set temperature −1 ° C., which is 1 ° C. lower than the temperature, and when the opening of the door 2 is detected, the on / off control of the air conditioner 3 (4) is maintained. The set temperature −1 ° C. is an example of the “second threshold temperature” in the present invention.

  When the door 2 is closed, the two air conditioners 3 and 4 are independent from each other based on the temperatures detected by the temperature sensors 34 and 44 provided for each air conditioner by the control units 31 and 41. And when the door 2 is opened, it is configured to be controlled independently of each other based on the temperature detected by the door temperature sensors 21 and 22 provided for each air conditioner. Yes.

  Next, with reference to FIG. 2, the cooling control process of the air conditioner 3 (4) by the control part 31 (41) of the refrigeration system 100 by this embodiment is demonstrated. This cooling control process is continuously performed while the refrigeration system 100 is in operation. Further, the control units 31 and 41 perform this cooling control process independently of each other.

  In step S1, it is determined from the detection result of the door sensor 23 whether or not the door 2 is closed. If the door 2 is closed, the process proceeds to step S2, and if the door 2 is opened, the process proceeds to step S9. When the door 2 is closed, in step S2, the suction temperature data obtained by detecting the temperature of the upper temperature sensor 34 (44) in the refrigerated warehouse 1 is acquired.

  In step S3, it is determined whether or not the suction temperature is higher than a set temperature. If the suction temperature is higher than the set temperature, the process proceeds to step S4, and if the suction temperature is equal to or lower than the set temperature, the process proceeds to step S5. In step S4, control for opening the electromagnetic valve 37 (47) of the unit cooler 32 (42) is performed. That is, when the door 2 is closed, the unit cooler 32 (42) is forcibly turned on when the temperature of the upper part in the refrigerated warehouse 1 is higher than the set temperature. Thereafter, the cooling control process is terminated.

  In step S5, it is determined whether or not the suction temperature is lower than the set temperature -1 ° C. If the suction temperature is lower than the set temperature -1 ° C, the process proceeds to step S6. If the suction temperature is equal to or higher than the set temperature -1 ° C, the process proceeds to step S8. In step S6, it is determined from the detection result of the door sensor 23 whether the door 2 is closed. If the door 2 is closed, the process proceeds to step S7, and if the door 2 is opened, the process proceeds to step S8. When the door 2 is closed, in step S7, control for closing the electromagnetic valve 37 (47) of the unit cooler 32 (42) is performed. Thereafter, the cooling control process is terminated.

  When it is determined in step S5 that the suction temperature is equal to or higher than the set temperature-1 ° C. (set temperature-1 ° C. ≦ suction temperature ≦ set temperature), or when it is determined in step S6 that the door 2 is opened. In step S8, the electromagnetic valve 37 (47) is kept open and closed. That is, when the electromagnetic valve 37 (47) is open, the opened state is maintained, and when the electromagnetic valve 37 (47) is closed, the closed state is maintained. Thereafter, the cooling control process is terminated.

  When it is determined in step S1 that the door 2 is open, in step S9, door temperature data is acquired by detecting the temperature of the lower door temperature sensor 21 (22) in the refrigerated warehouse 1. In step S10, it is determined whether the door temperature is higher than the set temperature. If the door temperature is higher than the set temperature, the process proceeds to step S11. If the door temperature is equal to or lower than the set temperature, the process proceeds to step S2.

  In step S11, control for opening the electromagnetic valve 37 (47) of the unit cooler 32 (42) is performed. That is, when the door 2 is open, the unit cooler 32 (42) is forcibly turned on when the temperature in the lower part of the refrigerated warehouse 1 is higher than the set temperature. Thereafter, the process proceeds to step S2.

  In the above embodiment, the following effects can be obtained.

  In the present embodiment, as described above, when the door 2 is closed, the air conditioner 3 (4) is controlled based on the temperature detected by the temperature sensor 34 (34), and the door 2 is opened. The lower door 2 in the refrigerator warehouse 1 is provided by providing a control unit 31 (41) for controlling the air conditioner 3 (4) based on the temperature detected by the door temperature sensor 21 (22). When opened, the air conditioner 3 (4) can be controlled based on the temperature detected by the lower door temperature sensor 21 (22) whose temperature is higher than that of the upper portion, so the door 2 is opened. In this case, the refrigerated warehouse 1 can be quickly cooled. Thereby, when the door 2 provided in the lower part of the refrigerator warehouse 1 is opened, it can suppress that the temperature in the refrigerator warehouse 1 becomes high. Further, when the door 2 is closed, it is based on the temperature detected by the temperature sensor 34 (44) disposed at the upper part where the temperature is higher than the lower part due to solar radiation or natural convection of air. Since the air conditioner 3 (4) can be controlled, it is possible to suppress the temperature of the upper part in the refrigerated warehouse 1 from increasing when the door 2 is closed. Further, when the door 2 is opened, the air conditioner 3 (4) is controlled not only based on the opening of the door 2, but also based on the temperature detected by the door temperature sensor 21 (22). The temperature inside can be controlled accurately. Thereby, excessive cooling can be suppressed and energy saving can be achieved.

  In the present embodiment, as described above, the temperature sensor 34 (44) is disposed in the vicinity of the unit cooler 32 of the upper air conditioner 3 (the unit cooler 42 of the air conditioner 4) in the refrigerated warehouse 1, and the door The temperature sensor 21 (22) is disposed in the vicinity of the lower door 2 in the refrigerated warehouse 1. Thereby, the door temperature sensor 21 (22) disposed in the vicinity of the door 2 can quickly detect the temperature increase in the vicinity of the door 2 of the refrigerated warehouse 1 due to the door 2 being opened. The refrigerated warehouse 1 can be quickly cooled by controlling the air conditioner 3 (4). Further, the air conditioner 3 (4) is controlled by the temperature detected by the temperature sensor 34 (44) disposed in the vicinity of the unit cooler 32 (the unit cooler 42 of the air conditioner 4) of the air conditioner 3 in the refrigerated warehouse 1. When the door 2 is closed, it is possible to effectively suppress the temperature of the upper part in the refrigerated warehouse 1 from becoming high.

  In the present embodiment, as described above, the control unit 31 (41) controls the opening and closing of the unit cooler 32 (42) by controlling the opening and closing of the electromagnetic valve 37 (47), and the door 2 is The unit cooler 32 (42) is controlled by opening the solenoid valve 37 (47) when it is opened and the temperature detected by the door temperature sensor 21 (22) is higher than the set temperature. Configure to force to turn on. Thereby, when the door 2 is opened and the temperature of the lower part in the refrigerated warehouse 1 becomes higher than the set temperature, the unit cooler 32 (42) is forcibly turned on by the control of the electromagnetic valve 37 (47). Therefore, when the door 2 is open | released, it can suppress reliably that the temperature in the refrigerator compartment 1 becomes high.

  In the present embodiment, as described above, the controller 31 (41) sets the temperature detected by the door temperature sensor 21 (22) when the door sensor 23 detects the opening of the door 2. When the temperature is higher than the temperature, the air conditioner 3 (4) is forcibly turned on, the door sensor 23 detects the opening of the door 2, and the door temperature sensor 21 (22) detects it. When the measured temperature is equal to or lower than the set temperature, the air conditioner 3 (4) is controlled to be turned on / off based on the temperature detected by the temperature sensor 34 (44). Thereby, since the opening of the door 2 can be easily detected using the door sensor 23, the temperature in the refrigerated warehouse 1 is based on the temperature detected by the temperature sensor 34 (44) or the door temperature sensor 21 (22). Can be easily controlled. If the temperature in the lower part of the refrigerated warehouse 1 does not increase even when the door 2 is opened, the air conditioner 3 (4) is controlled based on the temperature sensor 34 (44) in the upper part of the refrigerated warehouse 1. Therefore, the temperature in the refrigerated warehouse 1 can be controlled more accurately.

  In the present embodiment, as described above, when the controller 31 (41) performs on / off control of the air conditioner 3 (4) based on the temperature detected by the temperature sensor 34 (44), the temperature sensor When the temperature detected by 34 (44) is lower than the set temperature −1 ° C. and when the opening of the door 2 is detected, the on / off control of the air conditioner 3 (4) is maintained. Thereby, even when the door 2 is opened, if the temperature of the upper part in the refrigerated warehouse 1 is lower than the set temperature −1 ° C. and the cooling is sufficient, the on / off of the air conditioner 3 (4) is maintained. Therefore, an appropriate cooling state can be maintained. Thereby, the temperature rise resulting from opening of the door 2 can be suppressed effectively.

  In the present embodiment, as described above, when the door 2 is closed, the plurality of air conditioners 3 and 4 are detected by the temperature sensors 34 and 44 provided for each of the plurality of air conditioners 3 and 4. Are controlled independently of each other based on the detected temperature, and when the door 2 is opened, based on the temperature detected by the door temperature sensors 21 and 22 provided for each of the plurality of air conditioners 3 and 4. So that they are controlled independently of each other. Accordingly, when the door 2 is opened, the plurality of door temperatures are controlled by independently controlling the plurality of air conditioners 3 and 4 based on the detection results of the plurality of door temperature sensors 21 and 22 provided individually. Since the plurality of air conditioners 3 and 4 can be individually controlled according to the temperature at the installation position of the sensors 21 and 22, more accurate temperature rise suppression control can be performed when the door 2 is opened.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the said embodiment, although the example which applies this invention to a refrigeration system provided with a refrigerated warehouse was shown, this invention is not limited to this. The present invention may be applied to a refrigeration system including a refrigeration room other than a refrigerated warehouse. For example, the present invention may be applied to a showcase or a refrigerator.

  Moreover, in the said embodiment, although the example of the structure of the refrigerator system provided with two air conditioners was shown, this invention is not limited to this. In the present invention, the refrigeration system may include one or three or more air conditioners.

  In the above embodiment, when the door is open, the air conditioner is turned on when the temperature detected by the door temperature sensor (second temperature sensor) is higher than the set temperature (first threshold temperature). Although the example of the structure which performs control to show is shown, this invention is not limited to this. In the present invention, for example, control may be performed to turn on the air conditioner when the temperature detected by the second temperature sensor continues to be high for a certain period of time.

  Moreover, in the said embodiment, the door temperature sensor (2nd temperature sensor) is arrange | positioned in the door vicinity, and the example of a structure which arrange | positions a temperature sensor (1st temperature sensor) in the unit cooler (air conditioner in a refrigerator compartment) vicinity is shown. However, the present invention is not limited to this. In the present invention, the second temperature sensor may not be disposed near the door as long as the second temperature sensor is disposed in the lower part of the refrigerator compartment. Moreover, the 1st temperature sensor may not be arrange | positioned in the vicinity of the air conditioner in a refrigerator compartment, if it is arrange | positioned in the upper part in a refrigerator compartment.

  Moreover, in the said embodiment, although the example of the structure provided with one door was shown, this invention is not limited to this. In the present invention, a plurality of doors may be provided. In this case, each door may be provided with a door sensor. Further, a second temperature sensor may be provided in the vicinity of each door.

  Moreover, in the said embodiment, although the temperature sensor (1st temperature sensor) and the door temperature sensor (2nd temperature sensor) showed the example of the structure provided for every several air conditioner, this invention is shown to this. Not limited. In the present invention, a common (one) first temperature sensor may be provided for a plurality of air conditioners, or a common (one) second temperature sensor may be provided for the plurality of air conditioners.

  Moreover, in the said embodiment, although the example of the structure which controls a some air conditioner mutually independently was shown, this invention is not limited to this. In the present invention, a plurality of air conditioners may be controlled in cooperation.

In the above embodiment, an example of a configuration using a carbon dioxide (CO ₂₎ as a refrigerant, the present invention is not limited thereto. In the present invention, a refrigerant other than carbon dioxide may be used as the refrigerant. For example, a natural refrigerant other than carbon dioxide may be used, or an alternative chlorofluorocarbon refrigerant having an ozone layer depletion coefficient of zero may be used.

  In the above embodiment, for convenience of explanation, the control processing by the control unit has been described using a flow-driven flowchart in which processing is performed in order along the processing flow. However, the present invention is not limited to this. In the present invention, the processing by the control unit may be performed by event-driven (event-driven) processing that executes processing in units of events. In this case, it may be performed by a complete event drive type or a combination of event drive and flow drive.

1 Refrigerated warehouse (refrigerated room)
2 Door 3, 4 Air conditioner 21, 22 Door temperature sensor (second temperature sensor)
23 Door sensor 31, 41 Control unit 32, 42 Unit cooler (refrigerated indoor air conditioner)
33, 43 Refrigerator 34, 44 Temperature sensor (first temperature sensor)
37, 47 Solenoid valve (control valve)
100 refrigeration system

Claims (6)

A refrigerator room,
An air conditioner for cooling the refrigerator compartment;
A door provided at a lower part of the refrigerator compartment, for bringing articles into and out of the refrigerator compartment;
A first temperature sensor provided in an upper part of the refrigerator compartment;
A second temperature sensor provided in a lower part of the refrigerator compartment;
When the door is closed, the air conditioner is controlled based on the temperature detected by the first temperature sensor, and when the door is open, the door is detected by the second temperature sensor. A refrigeration system comprising: a control unit that controls the air conditioner based on temperature. The first temperature sensor is disposed in the vicinity of the air conditioner in the upper part of the refrigerator compartment,
2. The refrigeration system according to claim 1, wherein the second temperature sensor is disposed in the vicinity of the door at a lower portion in the refrigeration chamber. The air conditioner includes a refrigerator, a refrigerator indoor air conditioner connected to the refrigerator, and a control valve that controls a flow of refrigerant flowing into the refrigerator indoor air conditioner,
The control unit controls on / off of the refrigerating room air conditioner by controlling opening and closing of the control valve, and the temperature detected by the second temperature sensor when the door is opened. 3 is configured to forcibly turn on the refrigerating room air conditioner by performing control to open the control valve when the temperature is higher than the first threshold temperature. Refrigeration system. A door sensor for detecting the opening of the door;
The control unit forces the air conditioner when the door sensor detects the opening of the door and when the temperature detected by the second temperature sensor is higher than the first threshold temperature. When the door sensor detects the opening of the door and the temperature detected by the second temperature sensor is equal to or lower than the first threshold temperature, The refrigeration system of Claim 3 comprised so that on-off control of the said air conditioner may be performed based on the temperature detected by the said 1st temperature sensor.   The controller, when performing on / off control of the air conditioner based on the temperature detected by the first temperature sensor, has a temperature detected by the first temperature sensor lower than the first threshold temperature. 5. The refrigeration system according to claim 3, wherein the refrigeration system is configured to maintain on / off control of the air conditioner when the opening of the door is detected when the temperature is lower than a threshold temperature. . The air conditioner includes a plurality of air conditioners,
Each of the first temperature sensor and the second temperature sensor is provided for each of the plurality of air conditioners,
When the door is closed, the plurality of air conditioners are controlled independently from each other based on the temperature detected by the first temperature sensor provided for each of the plurality of air conditioners, and When the door is opened, the doors are configured to be controlled independently from each other based on the temperature detected by the second temperature sensor provided for each of the plurality of air conditioners. The refrigeration system according to any one of 5.

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